Perhaps you should try some spelling variations:
passiveene » passiven, passiveand, passivierende, passivene, passivierene, passiveande
aktivierende » aktivierenden, aktivieren, motivierende
passiveen » passiven, passivieren, passiveand
massiver » massive, massiven, passiver

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (passive OR ((passiveene OR (aktivierende OR passiveen)) OR massiver))*.